September 1946
Noboru Hayama opens Riso-sha, a mimeographic printing shop, in Tokyo.
September 1948
Company name changes to RISO Printing Company.
March 1952
RISO imports the first type printing equipment in Japan from the United Kingdom.
January 1955
Company name changes to RISO KAGAKU CORPORATION (“Ideal Science”).
July 1965
Kasumigaura Plant completed, starts operations in August.
June 1969
Sales offices open in Sapporo, Sendai, Nagoya, Osaka, Hiroshima, and Fukuoka.
September 1977
First Print Gocco model, the B6, marketed.
June 1980
First Printer-Duplicator model, the AP7200, marketed.
October 1981
Tsukuba Plant starts operations.
December 1984
RISO Educational Foundation established.
January 1986
RISO, Inc., the first overseas subsidiary, established in the United States. Ube Plant completed.
August 1986
First digital Printer-Duplicator model, the Digital 007, marketed.
April 1989
RISO EUROPE LTD. established in the United Kingdom.
October 1989
Listed over the counter in Japan.
December 1989
RISO (Deutschland) GmbH established.
January 1990
RISO Publisher System introduced.
April 1991
RISO FRANCE S.A. established.
May 1992
RISO (U.K.) LTD. established.
January 1993
RISO IBERICA S.A. established.
April 1993
RISO HONG KONG LTD. established.
June 1993
RISO CANADA, Inc. established.
July 1994
RISO CHINA LTD. established in Hong Kong.
November 1994
RISO (Thailand) LTD. established. Printer-Duplicator GR series introduced.
February 1995
RISO AFRICA (PTY) LTD. established.
June 1995
Printer-Duplicator TR series introduced.
February 1997
SC3000 series system controller introduced.
May 1997
SC7000 series system controller introduced.
November 1997
TM5000 sorter introduced. NC Numbering System introduced. Printer-Duplicator GR3770, the first 600 dpi duplicator introduced.